Bump Xamarin.AndroidX.Media2.Session from 1.2.1.2 to 1.2.1.7

Bumps [Xamarin.AndroidX.Media2.Session](https://github.com/xamarin/AndroidX) from 1.2.1.2 to 1.2.1.7.
- [Commits](https://github.com/xamarin/AndroidX/commits)

---
updated-dependencies:
- dependency-name: Xamarin.AndroidX.Media2.Session
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

ExoPlayer.Ext.Media2/ExoPlayer.Ext.Media2.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <AssemblyName>ExoPlayer.Ext.Media2</AssemblyName>
     <RootNamespace>ExoPlayer.Ext.Media2</RootNamespace>
@@ -14,7 +14,7 @@
   <!--
     <PackageReference Include="Xamarin.AndroidX.Collection" Version="1.2.0.4" />
     <PackageReference Include="Xamarin.AndroidX.Concurrent.Futures" Version="1.1.0.9" />-->
-    <PackageReference Include="Xamarin.AndroidX.Media2.Session" Version="1.2.1.2" />
+    <PackageReference Include="Xamarin.AndroidX.Media2.Session" Version="1.2.1.7" />
   </ItemGroup>
 
   <ItemGroup>